
The KTS550 has only serial and usb connection, but an oszilloscope. What interface is best to buy kts 540 or 550.?The KTS540 is newer (and recent) model, with bluetooth and usb connection.

There is also a KTS530, this is a KTS540 without bluetooth.For KTS550 (and KTS520) you need ubox02-cable for latest cars, KTS540 has ubox onboard.KTS550 can be made to work with porsche piwis.I think these are the most important differences, your decision.

